Safety valves are important safety accessories on boilers, pressure vessels and other pressurized equipment. The reliability and performance of its movement is directly related to the safety of equipment and people, and with energy conservation and environmental protection are closely related. And some users and design department in the selection, always choose the wrong model. To this end the selection of safety valve to be analyzed.
Second, the definition
The so-called safety valve in the broad sense, including the relief valve, from the management rules point of view, directly installed in a steam boiler or a class of pressure vessels, the necessary conditions must be approved by the technical supervision of the valve, narrowly referred to as the safety valve, Other commonly known as the relief valve. Safety valve and relief valve in the structure and performance are very similar, both in the opening pressure automatically discharge the internal media, in order to ensure the safety of the production plant. The existence of such an inherent similarity in the dry, people often use the two mix, in addition, some production facilities in the rules also provide for the choice of what can be. Therefore, the differences between the two are often overlooked. Thus there are many problems. If you want to make a clear definition of the two, you can follow the "ASME Boiler and Pressure Vessel Code," the first set forth in the definition to understand:
(L) Safety Valve
An automatic pressure relief device actuated by static pressure in front of the valve. It is characterized by having an open full opening action. For gas or steam occasions.
(2) Relief Valve
Also known as a relief valve by the valve medium before the static pressure-driven automatic pressure relief device. It opens proportionally as pressure increases beyond the opening force. Mainly used for fluid applications.
(3) Safety Relief Valve
Safety relief valve, also known as a pressure-driven automatic pressure relief device. Depending on the use of the occasion not only for the safety valve is also suitable as a relief valve. In Japan, for example, safety valves and relief valves are clearly defined, and safety devices commonly used for large storage pressure vessels such as boilers are referred to as safety valves and are installed on pipelines or other facilities The relief valve. However, judging from the regulations of "thermal power generation technology" of the MITI, safety valves such as boilers, superheaters, reheaters, etc., are to be specified as a key part of the safety and security of equipment. In the lower side of the pressure reducing valve needs to be connected with the boiler and turbine occasions, need to install the relief valve or safety valve. So, safety valve requirements than the relief valve more reliable. In addition, judging from the rules and regulations of high-pressure gas regulations of Japan's Ministry of Labor and Ministry of Transport and shipping associations at all levels, we regard the guarantee of emissions as a safety valve without any guarantee The valve of the discharge is called the relief valve. Whether in the country Kai-type or micro-Kai collectively referred to as safety valve.
The finned tube is to improve the heat exchange efficiency. By adding fins on the surface of the heat exchange tube, the outer surface area (or inner surface area) of the heat exchange tube is increased, so as to achieve the purpose of improving the heat exchange efficiency. Such a heat exchange tube . Usually used for heat exchange between liquid and gas.
Finned tube is a heat exchange element. As a heat exchange element, finned tubes usually work under high-temperature flue gas conditions for a long time. For example, the finned tubes usually used in boiler or harsh environments, high temperature and high pressure, and in a corrosive atmosphere. This requires that the finned tubes should have high anti-corrosion properties, Anti-wear properties, lower contact resistance, higher Stability and anti-dusting ability.
There are many types of finned tubes, and new varieties are constantly emerging. According to the classification of processing technology, there are extruded fin tube; high frequency welded finned tubes; rolled formed finned tubes; suit formed finned tubes ; cast finned tubes; tension wound finned tubes; Inserted tubes.
According to the shape of the fins, there are square finned tubes; circular finned tubes; spiral finned tubes; longitudinal finned tubes; corrugated finned tubes; spiral serrated fins Helical Serrated Finned Tubes; pin-shaped finned tubes; integral plate-shaped finned tubes; inner finned tubes.
According to whether the fin material of the finned tube is the same as that of the base tube, it can be divided into: single metal finned tube, bimetallic composite finned tube.
Single metal finned tubes are classified by material into copper finned tubes; aluminum finned tubes; carbon steel finned tubes; stainless steel finned tubes; cast steel finned tubes.
Finned Tube,Extruded Fin,Brown Fin Tube,Longitudinal Finned Tube
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